Calculate the 99% confidence interval for a sample mean of 100, standard deviation of 10, sample size of 30, and t-value of 2.756.

• A. 100 ± 2.756 * √30 / 10
• B. 100 ± 2.756
• C. 100 ± 2.756 * 10 / √30
• D. 100 ± 10 / 2.756

Answer: (C)